Telephone instrument



June 10, 1930. J. SCHNEIDER Er AL 1,762,641

TELEPHONE INSTRUMENT Filed July 10, 1929 2 Sheets-Sheet l June 10, 1930.

Filed Jul 10, 1929 J- SCHNEIDER ET AL TELEPHONE INSTRUMENT 2 Sheets-Sheet 2 mzm r wifirg ibw 41,9;- vQZiZorn a);

Patented June 10, 1930 UNITED STATES PATENT OFFICE.

J'OHANN SCHNEIDER AND GEORG HEGKMANN, OF FRANKFORT-ON-THE-MAIN, GER- MANY, ASSIGNORS TO THE FIRM H. FULD & 00., TELEPHONE UNI) TELEGRAPHEN- WERKE, 'AKTIENGESELLSCHAFT, OF FRANKFORT-ON-THE-MAIN, GERMANY L TELEPHONE INSTRUMENT i 7 Application filed. July 10, 1929, Serial No. 377,279, and in Germany July 11, 1928.

This invention relates to telephone instruments, and its purpose is to simplify the construction and assembling of same.

According to the invention, all the parts 5 needed for operating the instrument are secured upon and to a baseplate which is covered by a casing. This arrangement has the advantage of simplifying the assembling, and also the mechanical and electrical testing, of the instrument. In particular, the mounting of the support for the microtelephone on the baseplate enables the reversing contacts operated by the support to be tested' in working condition. To complete the assembling, all that is needed is to slip the czising over the completely equipped base ate. p Features of the invention will become apparent from the following description and from the accompanying drawing whereon several embodiments are illustrated by way of example.

Fig. 1 represents a sectional elevation of a table instrument.

Fig. 2 is a plan of the instrument baseplate.

Fig. 3 is a front elevation of the instrument.

Fig. 4 shows, in sectional elevation, the employment of the instrument as a wall instrument.

Figs. 5 to 7 represent different embodi ments of the supporting device for, the miwhen the microtelephone is lifted ofi t e crotelephone of the wall instrument.

Referring first to Figs. 1 to'3, 10 denotes the casing that surrounds the telephone instrument. This casing 10 may consist of drawn or press stamped sheet metal, but may be manufactured of-any other convenient material (and preferably of insulating material) by a die-casting or press stamping process. Inside the caslng is disposed the baseplate 11, which is adapted to the form of the casing. This baseplate 11 runs parallel to the upper wall and rear wall of the casing, and its lower part is extended far enough to form-the bottom of the instrument. The baseplate is inone piece of substantially angular or,L-shape, and is preferably made from sheet metal by stamping and bending. For the attachment of the various appliances, it is provided with recesse's, holes, and bent lugs, the purpose of which will be described in detail hereinafter.

The support for the microtelephone (not shown) consists of two forks 12 of 'U-form and preferably consisting of insulating mathe said framework 11. Each actuating rod 15 is guided in a hole 17 provided in a In 18 bent out from the substantially vertica leg of the angular baseplate. Coiled round each rod 15 is a helicoidal spring 19, one end of which bears against the fork 12, whereas the other end engages the lug 18, and which tends to press said fork upwards, this movement being limited by a stop such as a cotter 20 inserted in the rod 15. The forks 12 move independently of each other, but their actuating rods 15 act on a common rail or yoke 21, which is movably mounted on lugs 23 of the baseplate 11 by which is adapted to come into position between the springs of the contact set 16, and thus establish contact between the sprin s hooks; that is, when the rail 21 ascends into the position shown.

As already mentioned, both the su orting forks 12 are independently mova e, so that each of them can actuate by means of its rod 15 the reversing contact set 16. This has the advantage that the line is effectually switched off, even when the microtelephone is incorrectly placed on the support, for instance, if the microtelephone is merely laid on the onefork at the end of a conversation.

The contact-set 16 is attached, by means of a bracket 25, to the baseplate 11 whose upper ortion also carries aninduction coil 26, an a plate 27 on'which a condenser 29 is secured by means of a yoke 28.

which closes the opening left in the baseplate.

phone installations. According to the in-- vention, this dial 33 is also secured on the baseplate 11, and said dial and the supporting forks 12 are the only fittings that pass through the hoodlike casing 10. Since both parts 12 and 33 respectively lie in different planes, and as their sides passing the cover are not parallel to each other as may best be seen from Fig. 1, it would be impossible to take ofi the cover 10 from the baseplate 11, were it not that, according to the invention, one of the parts is movably mounted on the baseplate, said part preferably being the dial unit 33. With this object, two lugs 34 are bent out of the baseplate and are provided with studs 35. The dial 33 is secured on a U-shaped bail or yoke 36 whose two ends are provided with angular or L-slots 37 which are slipped over the studs 35. In this manner the dial is pivotally mounted on the baseplate 11 and can easily be detached from the bearing.

The dimensions of the yoke 36 and the lugs 34 are so calculated that the pivotal axis 35' is on a lower level than the lowest point of the dial 33 or its base support in relation to the baseplate 11. Such pivotal. movement of the dial, enabling the casing 10 to be lifted vertically, is feasible only when the pivotal axis 35 is at right. angles to the axis of the dial and on sucha level.

To prevent the pivotal movement of the dial causing damage to any other fittings of the instrument, such as the induction coil 26, said movement is limited by means of stops. The ends of the oke 36 are provided with recesses 38 in ea of which engages a stop 39 consisting of a screw fixed in the lug 34. The screws 39 also serve to secure terminal strips 40 consisting of insulating material disposed on both sides of the baseplate 11 and bearing any suitable number of connecting terminals, one end of said strips fitting into corresponding recesses in the baseplate, whilst the other end is secured to the lugs 34 by the screws 39. These strips support a plurality of terminals 40' for the wire connections (not shown) of the different devices of the station.

The call bell 42 is disposed between the lugs 34 and is secured to the baseplate 11 by screws 43, which at the same time serve for the attachmentof a cover plate 44, of any convenient non-magnetic material,

11 by the turning up of the lugs 34. For the passage of the sound produced by the bell, openings 46 are provided in the baseplate below the bell, and are covered with gauze so as to exclude dust.

On each side of the lower portion of the baseplate 11 is a depression 47 provided with a slot 48 and leaving, on the under side, a space for the accommodation of a pivoted book 49. Corresponding lugs 50, provided with eyes 51, are attached to the inside of the casing. is placed in position on the baseplate, the lugs 50 engage through the slots 48, where-. upon the hooks 49 are inserted into the eyes 51 in said lugs, thereby fastening the casing and baseplate together in a simple and se When the casing 10.

cure-manner, without the necessity for any special fastening meansindependent of the baseplate or casing.

The arrangement of all the fittings on the baseplate in accordance with the invention,

renders the structure extremely compact, so

that the width of the instrument dependsentirely on the diameter of the dial 33, whilst the height is approximately dependent on the dimensions of the condenser 29.- Individual fittings may, of course, be disposed on the baseplate in other ways than as described. v

Fig. 4 shows the telephone instrument modified for use as a wall instrument. The suspension is effected in a simple manner by utilizing the sound openings 46 for the passage of wall hooks 52. The feet 31, provided on-the baseplate, hold the instrument out of contact with the wall. With this method of suspending the instrument, the support for the microtelephone is situated below the dial 33, which latter, for proper manipulation, must be-set round through an angle of 180 on the lugs 34. As can be seen, this is easily practicable owing to themethod of mounting the dial on the studs 35 by means of the angular slots 37. in the yoke 36.

In the wall instrument, the pressure of the microtelephone acts parallel to the base surand enable the supporting members 53 to describe a swinging movement. Each member 53 is also provided with a stop 56, which presses against an actuating rod 57. Said actuating rod 57 is guided in the lugs 18 of the baseplate 11, as in the .table instrument, and round it is coiled a spiral spring 58 which bears against the lug 18 and a cotter 59 so that it tends to press the actuating The support 53 is also provided with a guide pin 61 passing through an opening 14 in the baseplate;

When the microtelephone (the handle 62 of which is shown in section in Fig. 4) is placed on the supporting members 53, the latter assume the position shown in Fig. 4,

and thereby press the actuating rods 57 to-' wards the left, against the action of the springs 58. The ends of the actuating rods then actuate the rail 21 shown in Fig. 1, and therewith the reversing contact 16.

Fig. 5 shows another embodiment of the supporting device for the wall instrument, in which a fixed member 63 replaces each movable support 53. This embodiment has the advantage that any accidental contact with the member 63 in dialling will not affect the reversing contact 16 and set up any interruption in the connection. The members 63 are provided with lugs 64 which are inserted, from the side, into recesses 65 (Fig. 1) in the baseplate 11. A slider 66 is movably disposed in a slot in each support 63, its front surface being. chainfered so that placing the microtelephone on the support causes the slider to move laterally. Said slider 66 carries an actuating rod 67, which is again guided in the lugs 18 of the base plate 11 and transmits the movement of the slider to the rail 21 (not shown in Fig. 5). The slider is also provided with a guiding fin 68,which passes through one of the openings 14 in the baseplate. As before, the rod 67 carries a spring 58 which presses the slider outwards, the movement being restricted by a cotter 60 on said road.

Fig. 6 represents still an other embodiment of the supporting device in which the horizontally movable slider '66 is replaced by a rocking member 69, which is shown separately in Fig. 7. The fixed supporting member 70 is again slipped on to the baseplate 11. It is provided with a pivot 71 on which the rocking memben 69 is mounted. Said rocking member 69 has two downwardly bent lugs 72, which engage round the support 70, and an inwardly turned nose 73 which strikes against a corresponding lug 74 on said support to limit the rocking movement. The actuating 'rod 75 bears i11- ternally against the crosspiece of the rocking member 69, and is again guided in the lugs 18 of the baseplate 11, and tends to press the rocking member outwards under the action of the spring 58. To facilitate tranmission of the movement of the rocking member to the rod 75, the end of the rod is hollowed, and a ball 76 is inserted in the opening. Since, in this embodiment, the opening for the actuating rod is completely masked, the penetration of dustinto the in terior of the instrument is effectually prevented.

We claim 1. In a telephone subscribers station the arrangement of a supporting framework comprising means for attaching and supporting the acting parts of the station such as coils, contacts, ringing device and microtelephone supporting parts, and a casing surrounding the said framework and being provided with holes for passing such parts which are to be acted upon from outside of the instrument such as microtelephone support, the parts passing the casing through these openings being of such cross section that they may be passed freely through the openings, and means for detachably connecting the said casing with the said framework.

2. In an automatic telephone subscribers station the arrangement of a supporting framework comprising means for attaching and supporting the acting parts of the station such as coils, contacts, ringing device, microtelephone support and a number dial, the said casing consisting of surrounding walls and a top wall, a part of the said top wall being arranged in a sloping direction whereas another part of the said top wall,

is arranged in substantial horizontal position, a circular hole in the said sloping part of the top wall for passing the number dial and holes in the substantially horizontal part of the wall for passing the said microtelephone supports, the said microtelephone supports being of a cross-section being adapted to freely be passed through the said openings, and means for detachably connecting the said casing with the said framework.

3. In an automatic telephone subscribers station the arrangement of a supporting framework comprising means for attaching and supportin the acting parts of the station such as coils, contacts, ringing device, microtelephone support and a number dial, the said casing comprising surrounding walls and a top wall, a part of the said top wall being arranged in a sloping direction whereas another part of the said top wall is arranged in substantial horizontal direction, a circular hole in the said sloping, part of the top wall for passing t e number dial, means for connecting the said number dial with the said framework, and a pivotable joint in the said connection comprising a horizontally arranged pivot.

4. An automatic telephone subscribers station comprising a supporting framework, a baseplate forming part of the said framework, a casing covering the said supporting framework, means for detachably connecting the covering casing with the said framework being arranged underneath the said baseplate, a number dial unit comprising a rotary number dial rotarily supported by.

a spindle and a supporting basepart rotarily v supporting the said dial, atop wall in the said casing arranged in a sloping direction and having a circular hole for passing the said number dial a U-shaped yoke underneath the said number dial unit base part, comprising two downwardly directed arms,

angular slots at one side of each of the-said baseplate whereas the other leg forms a back wall of substantially vertical arrangement,

vertical extending lugs bent upwardly from the said baseplate forming leg, a number dial unit, means for pivotably securing the said number dial unit to horizontally arranged pivots fixed to the said upwardly directed lugs, stops for limiting the angle of rotation about the said pivots, holes in the said substantially vertical leg of the said framework opposite the said lugs, terminal strips consisting of insulating material fitting with one end into one of the said holes, means for attaching the other end of each of the said stri s'to the said'lu a casing adapted to em race the said ramework, means for detachably securing the said casing to the said framework and a circular hole in the top side of 'the cover for passing the said number dial.

6. An automatic telephone subscribers station comprising a sheet metal framework of angular form with one leg forming a baseplate Whereas the other leg forms a back wall of substantially Vertical arrangement, vertical extending lugs bent upwardly from the said baseplate forming leg, a number dial unit, means for pivotably securing the said number dial unit to horizontally arranged pivots fixed'to the said upwardly directed lugs, stops for limiting the angle of rotation about the said pivots, holes in the said substantially vertical leg of the said framework opposite the said lugs,terminal strips consisting of insulating material and telephone supports consisting of forks of insulating material, vertically arranged guide pins and actuating rods at the said orks, holes in the said horizontally arranged lugs for guiding the said pins, actuating rod, a set of contact springs supported bythe said vertically arranged leg, a part pivotably supported by further lugs formed by stamping and bending from the said,

work of substantial angular form, a plurality of vertical and horizontal arranged lugs in both legs of the said angular framework, means for supporting and guiding subscribers station part by means of the said lugs, a casing adapted to embrace the said framework and consisting of stamped insulating material, and being of hoodlike shape, one of the legs of the said angular framework substantially closing the open side .of the said hoodlike part, slots in the said leg, lugs provided with eyes secured at the inner side of the said hoodlike casing and being adapted to pass the saidcovering leg, hooks at the underside of the said leg and being adapted to engage the said eyes, so as to secure the said hoodlike casing to the said angular framework.

In testimony whereof we-aflix our signatures.

J OHANN SCHNEIDER. GEORG HECKMANN.

fitting with one end into one of the said,

holes, means for attaching the other end of each of the said strips, to the said lug, :the

said terminal strips supporting a plurality of terminals for securing wire connections,

horizontally arranged lugs formed by bending or stamping fromthe said vertically arranged leg, holes in the said lugs, micro- 

